CN117538015A - Dimmer detection method, dimmer detection circuit and LED lamp - Google Patents

Dimmer detection method, dimmer detection circuit and LED lamp Download PDF

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Publication number
CN117538015A
CN117538015A CN202210917266.7A CN202210917266A CN117538015A CN 117538015 A CN117538015 A CN 117538015A CN 202210917266 A CN202210917266 A CN 202210917266A CN 117538015 A CN117538015 A CN 117538015A
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China
Prior art keywords
dimmer
waveform
output voltage
driving circuit
standard
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CN202210917266.7A
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Inventor
杨红磊
查胜
戴忻
高桥晓良
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to CN202210917266.7A priority Critical patent/CN117538015A/en
Priority to JP2023111028A priority patent/JP2024020150A/en
Publication of CN117538015A publication Critical patent/CN117538015A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/14—Controlling the light source in response to determined parameters by determining electrical parameters of the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention relates to the technical field of illumination, in particular to a dimmer detection method, a dimmer detection circuit and an LED lamp. The invention provides a dimmer detection method for detecting whether a dimmer is connected in a driving circuit, comprising the following steps: the method comprises the following steps of S1, collecting an output voltage waveform when a driving circuit works, and obtaining a characteristic value of the waveform of the output voltage waveform in a non-lifting edge section; and a comparison and judgment step S2, wherein whether the driving circuit is connected with the dimmer is judged according to the comparison of the characteristic value and the corresponding standard value in the standard waveform model. According to the dimmer detection method provided by the invention, the output voltage waveform is calculated and compared with the standard waveform when the circuit is not connected with the dimmer in real time, so that whether the circuit is connected with the dimmer or not is judged more accurately, and the subsequent corresponding circuit regulation control is performed.

Description

Dimmer detection method, dimmer detection circuit and LED lamp
Technical Field
The invention relates to the technical field of illumination, in particular to a dimmer detection method, a dimmer detection circuit and an LED lamp.
Background
In lighting systems, dimmers are typically used to provide an input signal to the lighting system, to adjust the current or voltage of the lighting system, thereby enabling adjustment of the luminous flux of the light sources in the lighting system, and adjustment of the illuminance level of the light sources in the lighting system.
In the prior art, dimmers typically chop the waveform of the input signal to the lighting system and deliver the remainder of the chopped waveform signal to the lighting system. For example, a leading edge or forward phase dimmer chops the leading edge of the voltage signal waveform, or a trailing edge or reverse phase dimmer chops the trailing edge of the voltage signal waveform.
In the prior art CN105265026a, a method for detecting a leading edge phase cut dimmer is provided, by detecting whether an input signal waveform has a fast rising edge, if so, making an edge detector output signal include signal pulses, and then determining whether the leading edge phase cut dimmer is connected to a circuit according to the number of stretched pulses within a predetermined amount of time of the pulse stretcher output signal.
As shown in FIG. 1, the input signal waveform is as V when the dimmer is not connected SUPPLY The sinusoidal waveform shown. After chopper modulation by the dimmer, the leading edge of the waveform of each half cycle is phase cut, and the part of the waveform shown by the dotted line is chopped, i.e. as V DIM Shown, the leading edge of the waveform is V F Where a fast rising edge is formed.
However, in practical applications, if the load loop in the lighting system cannot provide enough maintenance current for the dimmer, the dimmer cannot work normally, or the voltage output waveform of the dimmer is abnormal, the corresponding chopper waveform will also be abnormal. For example, as shown in fig. 2, an abnormal signal is generated at the waveform leading edge of each half cycle. If the fast rising edge detection mode is still adopted for the waveforms, whether the circuit is connected with the dimmer is judged, and the misjudgment rate is high.
Disclosure of Invention
Aiming at the problems, the invention provides a dimmer detection method, a dimmer detection circuit and an LED lamp. According to the dimmer detection method provided by the invention, the output voltage waveform is calculated and compared with the standard waveform when the circuit is not connected with the dimmer in real time, so that whether the circuit is connected with the dimmer or not is judged more accurately, and corresponding circuit regulation control is performed.
The technical scheme of the invention provides a dimmer detection method which is used for detecting whether a dimmer is connected in a driving circuit or not, and comprises a signal acquisition step S1, wherein an output voltage waveform of the driving circuit during working is acquired, and a characteristic value of the waveform of the output voltage waveform in a non-lifting edge section is obtained; and a comparison and judgment step S2, wherein whether the driving circuit is connected with the dimmer is judged according to the comparison of the characteristic value and the corresponding standard value in the standard waveform model.
According to the technical scheme of the invention, the non-rising edge section, namely the section which is not the rapid rising edge or the rapid falling edge, is provided with a plurality of sampling data points, and the characteristic value of the waveform obtained by combining the plurality of sampling data points is compared with the standard value in the standard waveform, so that whether the waveform is formed by chopping can be reflected more integrally and comprehensively, thereby reducing the misjudgment rate and improving the detection accuracy.
Preferably, in the technical solution of the present invention, the dimmer detection method further includes a model building step S0, and a standard waveform model is built according to the output voltage waveform of the driving circuit of the unconnected dimmer.
According to the technical scheme of the invention, the waveform of the driving circuit when the driving circuit is not connected with the dimmer is generally a standard sine waveform, the normal output voltage condition of the driving circuit when the driving circuit is not connected with the dimmer can be reflected, the normal output voltage condition is prestored into a standard waveform model, a more accurate reference standard can be provided, and the comparison and judgment of the output voltage waveform are convenient to follow.
Further, in the technical scheme of the invention, the dimmer detection method further comprises an adjustment protection step S3, and if the driving circuit is judged to be connected with the dimmer, corresponding adjustment protection actions are performed.
According to the technical scheme of the invention, after the dimmer is connected with the driving circuit, the original output voltage of the driving circuit is subjected to chopping regulation, the integral output of the driving circuit is greatly influenced, and the input/output voltage and current conditions required by the dimmer may be different from those of the original driving circuit. Therefore, when the dimmer is determined to be connected to the driving circuit, the output circuit connected with the driving circuit is correspondingly regulated and protected, so that abnormal operation and even faults of the dimmer or other circuits or elements connected with the driving circuit can be avoided.
Preferably, in the present invention, the characteristic value of the output voltage waveform in the dimmer detection method is the number of points in the output voltage waveform, where the output voltage is 0V, in one or more periods.
According to the technical scheme of the invention, when the driving circuit is not connected with the dimmer, the output voltage waveform, namely, the number of points with 0V in each period in the standard waveform model is 0 or 1, the number of points with 0V in the output voltage is taken as a characteristic value, the number of points with 0V in the output voltage waveform is taken as a standard value of the standard waveform model, and when the number of points with 0V in each period in the output voltage waveform is 2 or more, the driving circuit is connected with the dimmer. By the method, the judgment of whether the light modulator exists or not can be rapidly and accurately finished with lower operation amount.
Preferably, in the present invention, the characteristic value of the output voltage waveform in the dimmer detection method is the number of points in which the derivative of the output voltage in the output voltage waveform is 0 in one or more periods.
According to the technical scheme of the invention, when the driving circuit is not connected with the dimmer, the output voltage waveform, namely the standard waveform model, is a sine waveform, the voltage rises first, then falls and then rises each period, the derivative of the voltage value is positive, then negative and then positive, 2 or less points with the derivative of 0 are included, the number of points with the derivative of 0 is taken as a characteristic value, and when the number of points with the derivative of 0 in each period in the output voltage waveform is more than 2, the driving circuit is indicated to be connected with the dimmer. By the method, the judgment of whether the light modulator exists or not can be rapidly and accurately finished with lower operation amount.
Preferably, in the technical scheme of the present invention, the characteristic value of the output voltage waveform in the dimmer detection method is a waveform similarity between the output voltage waveform and the standard waveform model.
According to the technical scheme of the invention, the waveform similarity is taken as a characteristic value, and when the values of the waveform abscissa are the same, whether the voltage values corresponding to the output voltage waveform and the standard waveform model at the same time point are the same is judged, so that the waveform similarity of the output voltage waveform and the standard waveform model is judged, and further whether a dimmer is connected to the driving circuit is judged. In this way, the determination of whether there is a dimmer can be done very accurately.
Further, in the technical scheme of the invention, the dimmer detection method further comprises the following steps: storing a plurality of standard waveform models having different frequencies and voltage amplitudes; in the comparing and judging step S2, the characteristic value is compared with the standard values corresponding to the plurality of standard waveform models one by one.
According to the technical scheme of the invention, when the frequency and the voltage amplitude of the output voltage of the driving circuit are different, the shape and the reference value of the standard voltage waveform obtained by operation of the driving circuit can be different. And providing standard waveform models under various different frequencies and voltage amplitudes for comparison, and if the output voltage model is different from each standard waveform model, indicating that the output voltage model is not the standard waveform, namely, a dimmer is connected in the driving circuit. In this way, the type of the current voltage waveform can be further resolved with a lower data storage amount.
In the technical scheme of the invention, a dimmer detection circuit is also provided, and the dimmer detection circuit can operate the dimmer detection method so as to judge whether a dimmer is connected in the circuit.
In the technical scheme of the invention, the invention also provides an LED lamp, which comprises the dimmer detection circuit.
According to the technical scheme of the invention, the LED lamp can be connected with the dimmer to adjust the luminous flux and the illumination intensity of the LED lamp. Meanwhile, the output voltage waveform can be calculated through the dimmer detection circuit, and the output voltage waveform is compared with a standard waveform model when the circuit is not connected with the dimmer in real time, so that whether the circuit is connected with the dimmer or not is accurately judged, corresponding circuit adjustment control is conveniently carried out, and the circuit connection of the dimmer and the LED lamp is better adjusted and protected while the excellent adjustment performance of the LED lamp illumination effect is realized.
Preferably, in the technical solution of the present invention, the lamp holder of the LED lamp is further adapted to mount other electrical devices incompatible with the dimmer, and when the dimmer detection circuit detects that the dimmer is connected to the driving circuit and the lamp holder is connected to the electrical device incompatible with the dimmer, the power supply to the electrical device is disconnected.
According to the technical scheme of the invention, the dimmer detection circuit detects that the dimmer is connected in the driving circuit, and the connection of the electrical equipment incompatible with the dimmer is disconnected, so that the electrical equipment and/or the dimmer can be protected, and the normal operation of the dimming function of the LED lamp is ensured.
Drawings
FIG. 1 is a schematic diagram of an input signal waveform of the prior art;
FIG. 2 is a schematic diagram of another prior art input signal waveform;
fig. 3 is a schematic diagram of a dimmer detection method according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a preferred dimmer detection method provided in a first embodiment of the present invention;
FIG. 5 is a schematic illustration of a standard waveform model provided in a first embodiment of the present invention;
fig. 6 is a schematic diagram of an output voltage waveform when a driving circuit is connected to a dimmer according to the first embodiment of the present invention;
fig. 7 is a schematic diagram of an output voltage waveform of a driving circuit provided in a second embodiment of the present invention;
fig. 8 is a schematic diagram of a dimmer detection circuit according to a fourth embodiment of the present invention.
Reference numerals illustrate: 1-switching circuit, alternating current power supply AC, control unit MCU, signal detection end x, signal output end y.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
[ first embodiment ]
Taking a light source driving circuit of the LED lamp as an example, the output voltage of the driving circuit is output to the LED light source to drive the LED light source to be lighted for illumination. According to the output voltage of the driving circuit, the brightness of the LED light source can be adjusted. Specifically, the driving circuit may be connected to a dimmer, which chops and phase-cuts the voltage waveform output from the driving circuit, thereby adjusting the duty cycle of the voltage waveform input into the LED light source, and controlling and adjusting the brightness of the LED light source.
Fig. 3 is a schematic diagram of a dimmer detection method according to a first embodiment of the present invention.
As shown in fig. 3, in a first embodiment of the present invention, a method for detecting a dimmer is provided, which is used for detecting whether a dimmer is connected to a driving circuit, and includes a signal acquisition step S1, wherein an output voltage waveform of the driving circuit during operation is acquired, so as to obtain a characteristic value of the waveform of the output voltage waveform in a non-rising and falling edge section; and a comparison and judgment step S2, wherein whether the driving circuit is connected with the dimmer is judged according to the comparison of the characteristic value and the corresponding standard value in the standard waveform model.
Where "non-rising edge segments", i.e. segments within one or more cycles other than a fast rising edge (i.e. the leading edge of the waveform at the chopping position), a fast falling edge (i.e. the trailing edge of the waveform at the chopping position). Comprehensive analysis is performed based on the segments of stable and/or variable voltage in one or more periods of the input voltage waveform, so that comprehensiveness of comparison basis, namely characteristic value selection, can be improved, and accuracy of waveform comparison judgment is further improved.
The characteristic value of the waveform may refer to a data characteristic of the input voltage waveform, such as a specific value in a period, e.g., a maximum value, a minimum value, etc.; the waveform of the input voltage can also be the shape characteristics, such as sine wave, cosine wave, triangular wave, wave crest, wave trough and the like of waveform variation; it may also be a variation law of the input voltage waveform, such as a periodic characteristic or the like. The characteristic value is not limited as long as it can represent the characteristic of the waveform modulated by the dimmer and the characteristic clearly distinguished from the standard waveform model.
Specifically, the driving circuit drives loads such as an LED light source to operate, according to the dimmer detection method, output voltage waveforms of the driving circuit during operation are collected in real time, compared with a pre-stored standard waveform model of the output voltage of the driving circuit when the driving circuit is not connected with the dimmer, the non-lifting edge section on which the comparison is based is provided with a plurality of sampling data points, characteristic values of the waveforms obtained by combining the plurality of sampling data points are compared with standard values in the standard waveforms, whether the waveforms are formed by chopping waves can be reflected more integrally and comprehensively, even when the dimmer is in an abnormal working state, misjudgment caused by unstable waveform change after the dimmer is modulated can be avoided or reduced, the accuracy of detecting the connection state of the dimmer is improved, and the driving circuit after the dimmer is connected with the dimmer can be regulated and controlled more conveniently and accurately.
Fig. 4 is a schematic diagram of a preferred dimmer detection method provided in the first embodiment of the present invention.
As shown in fig. 4, the dimmer detection method according to the first embodiment of the present invention further includes a model building step S0 of building a standard waveform model according to the output voltage waveform of the driving circuit to which the dimmer is not connected.
Referring to fig. 5, the waveform of the driving circuit when the dimmer is not connected is generally a sine waveform as shown in the drawing, the sine waveform can reflect the normal output voltage condition of the driving circuit when the dimmer is not connected, and the sine waveform is pre-stored into a standard waveform model, so that a more accurate reference standard can be provided, and the comparison and judgment of the output voltage waveform are convenient, wherein the ordinate U represents a voltage value, the abscissa T represents time, and one period of the sine waveform is 2T.
Preferably, in the first embodiment of the present invention, the characteristic value of the output voltage waveform in the dimmer detection method is the number of points in the output voltage waveform at which the output voltage is 0V in one or more periods.
It should be noted that the period of the characteristic value determination may be equal to the period of the output voltage waveform, such as the period of the actual cycle of the sine wave, for example, 2t, or may be multiple periods or any other artificially defined period of time that can be used to determine the characteristic value, which is not limited herein.
For example, in the first embodiment, since the ac voltage is rectified and the original negative voltage is reversed, the half period t of the sine wave is used as the period for the characteristic value determination. As shown in fig. 5, in the above-described one cycle, for example, 0 to t, there are 1 or 2 intersections of the waveform of the standard waveform model with the abscissa, and the number of points at which the output voltage of the output voltage waveform is 0V in one cycle is 1 or 2 as the standard value of the standard waveform model.
Fig. 6 is a waveform of an output voltage when a driving circuit is connected to a dimmer according to the first embodiment of the present invention.
As shown in fig. 6, the output voltage waveform subjected to chopper modulation by the dimmer has a continuous band with a voltage value of 0V in each period t, and the number of points, i.e., the characteristic value, of the output voltage of 0V in the output voltage waveform in one period t may vary according to the density of the sampling points, but are far greater than, for example, 1 or 2 threshold values, it can be determined that the characteristic value does not coincide with 1 or 2 standard values, and thus it can be determined that the output voltage waveform of the driving circuit does not coincide with the standard waveform model, and it can be determined that the driving circuit is connected to the dimmer. Conversely, if the number of points of the output voltage waveform of 0V in one period t, that is, the characteristic value is 1 or 2, that is, the characteristic value matches the standard value, it can be determined that the driving circuit is not connected to the dimmer. By the method, the judgment of whether the light modulator exists or not can be rapidly and accurately finished with lower operation amount.
Preferably, in order to avoid that abnormal conditions such as abrupt change of the output voltage due to interference factors affect the accuracy of the connection state judgment of the dimmer, in practical application, the detection method of the dimmer can be combined with the comparison condition of the characteristic values in a plurality of periods and the corresponding standard values in the standard waveform model to perform comprehensive judgment. Further, a plurality of periods can be selected to be discontinuous and have a period with a certain time interval, so that the comprehensiveness of characteristic value selection is further improved, and the accuracy of connection state judgment of the dimmer is further improved.
Further, in the first embodiment of the present invention, the dimmer detection method further includes an adjustment protection step S3, and if it is determined that the driving circuit is connected to the dimmer, a corresponding adjustment protection operation is performed.
According to the above steps, after the dimmer is connected to the driving circuit, the original output voltage of the driving circuit is chopper-regulated, the overall output of the driving circuit is greatly affected, and the input-output voltage and current conditions required by the dimmer may be different from those of the original driving circuit. Therefore, when the dimmer is determined to be connected to the driving circuit, the output circuit connected with the driving circuit is correspondingly regulated and protected, so that abnormal operation and even faults of the dimmer or other circuits or elements connected with the driving circuit can be avoided.
For example, when it is determined that a dimmer is connected to the driving circuit, a power supply (such as 220V mains supply) which is not matched with the dimmer is disconnected, so as to protect electrical equipment or loads which are connected in error in the driving circuit, and enable the electrical equipment or loads to normally and stably operate; or, the driving circuit can be connected with loads with different rated operation standards (such as LED light sources with different specifications or connection modes), after the dimmer is connected with the driving circuit to enable the output value of the driving circuit to change, the load connected with the driving circuit is switched, and the rated operation standard of the switched load is matched with the current output of the driving circuit, so that better lighting effect and the like are obtained.
[ second embodiment ]
In a second embodiment of the present invention, a method for detecting a dimmer is provided, wherein the steps of detecting and determining the dimmer are the same as those in the first embodiment, and are not described herein. The dimmer detection method of the present embodiment is different from the first embodiment in that the characteristic value of the output voltage waveform is the number of points in which the derivative of the output voltage in the output voltage waveform is 0 in one or more periods.
Fig. 7 is a schematic diagram of an output voltage waveform of a driving circuit provided in a second embodiment of the present invention.
As shown in fig. 7, when the driving circuit is not connected to the dimmer, a standard waveform model L is an output voltage waveform 1 In each period t (period determined by taking half period t of the sine wave as a characteristic value), the output voltage rises from 0 point, reaches a peak value, starts to fall, returns to 0 point again, and then enters the next period to continue the cycle. In one period t of the standard waveform model, the standard waveform model L 1 The derivative of the output voltage is positive and then negative, and 1 point is the derivative of the output voltage, namely 1 standard value of the standard waveform model. Wherein output voltage derivative = deltau/deltat = (u) 2 -u 1 )/(t 2 -t 1 )。
With continued reference to FIG. 7, the output voltage waveform L 2 The output voltage of the power supply is not in the form of a standard sine wave any more, in each period t, the output voltage rises from 0 point, starts to fall after reaching a first peak value, rises again after reaching a valley value, falls again after reaching a second peak value, returns to 0 point, and then enters the next period to continue to circulate. In a period t, a standard waveform model L 1 The derivative of the output voltage passing through positive-negative-positiveNegative change, with the number of points at which the derivative of the output voltage is 0, i.e., the characteristic value, being 3, can determine that the characteristic value does not match 1 standard value, and thus, it can be determined that the output voltage waveform of the driving circuit does not match the standard waveform model, and that the driving circuit is connected to the dimmer. Conversely, if the number of points in the output voltage waveform in which the derivative of the output voltage is 0, i.e., the number of eigenvalues is 1, i.e., the eigenvalues match the standard values in one period t, it can be determined that the driving circuit is not connected to the dimmer. In this way, the determination of whether there is a dimmer can be done very accurately.
Similarly, in the second embodiment of the present invention, in order to avoid that the accuracy of the connection state determination of the dimmer is affected by abnormal conditions such as abrupt changes of the output voltage due to interference factors, in practical application, the above-mentioned dimmer detection method may combine the comparison between the characteristic values in a plurality of periods and the corresponding standard values in the standard waveform model to perform comprehensive determination. Further, a plurality of periods can be selected to be discontinuous and have a period with a certain time interval, so that the comprehensiveness of characteristic value selection is further improved, and the accuracy of connection state judgment of the dimmer is further improved.
[ third embodiment ]
In a third embodiment of the present invention, a method for detecting a dimmer is provided, wherein the steps of detecting and determining the dimmer are the same as those in the first embodiment and the second embodiment, and are not described herein. The dimmer detection method according to the present embodiment is different from the first and second embodiments in that the characteristic value of the output voltage waveform is a waveform similarity between the output voltage waveform and the standard waveform model.
Specifically, the output voltage waveform when the driving circuit is not connected to the dimmer is taken as a standard waveform model, the shape of which is shown in fig. 5, wherein each horizontal coordinate point is corresponding to a corresponding vertical coordinate value, namely voltage. And when the values of the abscissa of the waveforms are the same, judging whether the voltage values corresponding to the output voltage waveforms and the standard waveform model at the same time point are the same or calculating the deviation degree, so as to judge the waveform similarity of the output voltage waveforms and the standard waveform model, and further judging whether the driving circuit is connected with a dimmer.
For example, referring to FIG. 5, the time in the standard waveform model is t 0 Corresponding output voltage u 0 The standard value of the standard waveform model is u 0 . Referring to FIG. 6, the time in the output voltage waveform is t 0 The corresponding output voltage is 0, i.e. the characteristic value is 0, and the characteristic value and the standard value u can be judged 0 If the output voltage waveform of the driving circuit does not match the standard waveform model, it can be determined that the driving circuit is connected to the dimmer. Conversely, the time t in the output voltage waveform 0 The corresponding output voltage is u 0 That is, if the characteristic value matches the standard value or the deviation is not large, it can be determined that the driving circuit is not connected to the dimmer. In this way, the type of the current voltage waveform can be further resolved with a lower data storage amount.
It should be noted that, in the present embodiment, the feature value, that is, the waveform similarity is represented by coordinates of one point. In practical applications, the waveform similarity may be represented by coordinates of a plurality of points, the overall shape of the waveform, and the trend of rising/falling.
Further, in a third embodiment of the present invention, the dimmer detection method further comprises the steps of: storing a plurality of standard waveform models having different frequencies and voltage amplitudes; in the comparing and judging step S2, the characteristic value is compared with the standard values corresponding to the plurality of standard waveform models one by one.
When the frequency and amplitude of the drive circuit voltage are different, the shape and reference value of the standard voltage waveform obtained by the operation of the drive circuit voltage may be different. In some embodiments, the following table may be consulted to provide standard waveform models at 6 different frequencies and voltages, with frequencies of 50Hz, 60Hz, and input voltages of 90V, 100V, 110V, respectively.
Voltage (V) Frequency (Hz) Voltage peak (V) Period (ms) Phase angle (°) Standard waveform
90 50 127.28 10 90 ①
90 60 127.28 8.33 90 ②
100 50 141.42 10 90 ③
100 60 141.42 8.33 90 ④
110 50 155.56 10 90 ⑤
110 60 155.56 8.33 90 ⑥
The standard waveform models (1) - (6) are all sine waveforms, but have different periods and amplitudes, namely at t 0 The voltage values corresponding to the moments are different, and the standard waveform models (1) - (6) have 6 or 6 groups of corresponding standard values. Comparing the characteristic value of the output voltage waveform with the corresponding standard values in the 6 standard waveform models one by one, and if the characteristic value of the output voltage model is different from the standard value of each standard waveform model, indicating that the current output voltage waveform indicates that the current output voltage waveform is not any standard waveform model, namely, a dimmer is connected in the driving circuit. If the characteristic value of the output voltage model is the same as the standard value of a certain standard waveform model, the driving circuit is not connected with a dimmer, and the frequency and the amplitude of the output voltage can be determined.
Further, in order to improve the accuracy of the detection of the connection state of the dimmer, the judgment bases in the three embodiments may be combined together to analyze and judge the output voltage waveform from various angles, so as to obtain a more accurate detection result.
[ fourth embodiment ]
Fig. 8 is a schematic diagram of a dimmer detection circuit according to a fourth embodiment of the present invention.
As shown in fig. 8, in a fourth embodiment of the present invention, there is provided a dimmer detection circuit including an AC power source AC, a control unit MCU, and a switching circuit 1, the switching circuit 1 being connected in parallel with the AC power source AC, a signal detection terminal x of the control unit MCU being connected to the AC power source AC, a signal output terminal y of the control unit MCU being connected to a control terminal of the switching circuit 1, the dimmer detection circuit being capable of operating the dimmer detection method described in the above embodiment, thereby determining whether a dimmer is connected in the circuit.
In a fourth embodiment of the present invention, an LED lamp is further provided, which includes the above-mentioned dimmer detection circuit.
According to the scheme, the LED lamp can be connected with the dimmer to adjust luminous flux and illumination intensity of the LED lamp. Meanwhile, the output voltage waveform can be calculated through the dimmer detection circuit, and the output voltage waveform is compared with a standard waveform model when the circuit is not connected with the dimmer in real time, so that whether the circuit is connected with the dimmer or not is accurately judged, corresponding circuit adjustment control is conveniently carried out, and circuit connection of the dimmer and the LED lamp is better adjusted and protected.
Preferably, in the fourth embodiment of the present invention, the lamp socket of the LED lamp is further adapted to mount other electrical devices incompatible with the dimmer, and when the dimmer detection circuit detects that the dimmer is connected in the driving circuit and the lamp socket is connected to the electrical device incompatible with the dimmer, the power supply to the electrical device is disconnected.
According to the scheme, the dimmer detection circuit detects that the driving circuit is connected with the dimmer, and the connection of the electrical equipment incompatible with the dimmer is disconnected, so that the electrical equipment and/or the dimmer can be protected, and the normal operation of the dimming function of the LED lamp is ensured.
The technical solution of the present invention has been described so far with reference to the accompanying drawings. However, it will be readily appreciated by those skilled in the art that the scope of the present invention is not limited to the above-described specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.

Claims (10)

1. A dimmer detection method for detecting whether a dimmer is connected in a driving circuit is characterized by comprising the following steps of
A signal acquisition step S1, namely acquiring an output voltage waveform when the driving circuit works, and obtaining a characteristic value of the waveform of the output voltage waveform in a non-lifting edge section;
and a comparison and judgment step S2, wherein whether the driving circuit is connected with a dimmer is judged according to the comparison of the characteristic value and the corresponding standard value in the standard waveform model.
2. The dimmer detection method of claim 1, further comprising
And a model building step S0, wherein a standard waveform model is built according to the output voltage waveform of the driving circuit of the unconnected dimmer.
3. The dimmer detection method according to claim 2, further comprising
And a protection step S3, if the driving circuit is judged to be connected with the dimmer, corresponding input adjustment protection action is carried out.
4. A dimmer detection method according to claim 3, wherein the characteristic value is a number of points in the output voltage waveform at which the output voltage is 0 during one or more periods.
5. A dimmer detection method according to claim 3, wherein the characteristic value is the number of points in the output voltage waveform at which the derivative of the output voltage is 0 over one or more periods.
6. A dimmer detection method according to claim 3, wherein said characteristic value is a waveform similarity of said output voltage waveform to said standard waveform model.
7. The dimmer detection method according to any one of claims 1-6, further comprising the steps of:
storing a plurality of said standard waveform models having different frequencies and voltage amplitudes;
in the step S2 of comparing and judging, the characteristic value is compared with the standard values corresponding to the standard waveform models one by one.
8. A dimmer detection circuit operating the dimmer detection method according to any one of claims 1-7.
9. An LED luminaire comprising the dimmer detection circuit of claim 8.
10. The LED lamp of claim 9, wherein the lamp base of the LED lamp is further adapted to mount other electrical devices that are not dimmer compatible,
when the dimmer detection circuit detects that a dimmer is connected in the driving circuit and the lamp holder is connected with an electrical device incompatible with the dimmer, power supply to the electrical device is disconnected.
CN202210917266.7A 2022-08-01 2022-08-01 Dimmer detection method, dimmer detection circuit and LED lamp Pending CN117538015A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202210917266.7A CN117538015A (en) 2022-08-01 2022-08-01 Dimmer detection method, dimmer detection circuit and LED lamp
JP2023111028A JP2024020150A (en) 2022-08-01 2023-07-05 Dimmer detection method, dimmer detection circuit, and led lighting fixture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210917266.7A CN117538015A (en) 2022-08-01 2022-08-01 Dimmer detection method, dimmer detection circuit and LED lamp

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